Dynamo-electric machine.



O. E. LORD.

DYNAMO ELECTRIC MACHINE. APPLICATION FILED SEPT. 2'4, 190s.

Patented Oct. 17, 1911.

Mm MW "Wm mu UNITED STATES PATENT OFFICE.

CHARLES E. LORD, or NORWOOD, OHIO, ASSIGNQR TO ALI..ISCHALME RS COMPANY, A

CORPORATION OF NEW JERSEY.

DYNAMO-ELECTRIC MACHINE.

To all whom it may concern:

Be it 'known that I, CHARLES E. Loan,

citizenof the United States, residing at Norwood, in the county of Hamilton and State 'ofOhio, have invented certain new and useful Improvements in Dynamo-Electric Machines,'of which the following is a full, clear,

and exact specification.

. tend between adjacent poles, each pole shoe having windings which extend to the adjacent shoe on each side. It is also customary to provide bridging members between the pole tips which bridging members are also slotted to receive the windings so that the windings are equally distributed around the -field. In machines provided with distributed auxiliary'windings, it is rather a difiicult matter to. remove the main field coils and also the auxiliaryfield coils in case retion of the field frame from the other, since the poles are bridged by the auxiliary windings.

removed.

-. v.In carrying out my invention I provide removable pole shoes which are split or divided into two portions so that one portion and the winding thereon may be removed I from the other.

More specifically considered my invention consists in a dynamo-electric machine having removable laminated pole shoes divided into two parts along the center of the pole, which pole shoes are provided with nonmagnetic bridging members, the pole shoesa-nd bridging members being slotted for the reception of an auxiliary field winding. The coils of the auxiliary winding are arranged in groups, each group being located in the slots Specification of Letters Patent.

Application filed September 24, 1906.

Patented Oct.'17, 1911. Serial N0. 338,024.

of the adjacent sections or halves of the pole shoes of adjacent poles and the non-magnetic bridging member between the poles, so that each group of coils can easily be removed by removing the pole shoe sections.

My invention still further consists in the details of construction and the combinations and arrangements of parts described in the specification and set forth in the appended claim.

For a better understanding of my inven tion, reference is had to the accompanying drawings in which- V Figure 1 is an end elevation of the ma-' chine equipped with my invention, parts being in section and removed; Fi 2 is an elevation of a lamina of one of the halves of a pole shoe; and Fig. 3 is a face view of one group of coils of the auxiliary winding and of the slotted parts in which the coils are located. I

Referring-now to the figures of. the drawing, I have shown at the field frame of a dynamoelectric machine provided with field poles 11 carrying main field coils" 12. I have in this case shown a four pole machine but it is evident that my invention can as well be applied to a machine having a greater or less number of poles. The field polescll may be either integral with the field frame or separable therefrom. In this case I have shown removable field poles, the latter being secured to the field frame by bolts 13. At the end of each field pole is a removable pole shoe 14.- each consisting of two halves or sections 14 and 14 which are in engagement'with each other along the center line of the pole. The pole shoe sections may be secured to the field poles in any suitable manner. In this case they are secured thereto by the bolts 18 which hold field oles 11 in place. In this instance the pole s oe sections are each provided with a recess or opening 15 in which is located a nut or bar 16 threaded to receive the threaded ends of the bolts asshown. The recesses 15 are preferably located in the body of the pole shoes, the inner laminae being provided with punched openings as shown in Fig. 2. The laminae of the pole shoes are preferably held together by rivets 17 Located between'adjacent pole shoes are bridging members 18 made preferably of non-magnetic-material.

The'pole shoes and bridging members 18 are in this case provided with slots for the reception of distributed auxiliary field windings 19 for preventing sparking at the brushes, as clearly shown in the drawing. The auxiliary windings consist of coils arranged in groups, the coils of each group being located in the slots of the two adjacent pole shoe sections 14 and 14- of adjacent poles, and the slots of the bridging member between such sections. This construction of the pole shoes and arrangements of the auxiliary windings permits the ready removal of any section of the auxiliary winding, for the reason that the pole shoe sections in which the coils of each group are located can be detached from the machine without otherwise disturbing the remaining pole shoe sections. Thus, if it is desired to remove one section ofthe auxiliary winding, the proper'bolts 13 extending into the corresponding pole shoe sections are removed permitting said sections and the intermediate bridging member 18 and the group of coils to be removed. In case it is desired to repair the auxiliary winding, the injured portion can be removed by removing one or more groups of coils. If it is desired to remove a field coil the pole shoe sections at the ends of the pole are detached from the pole by removing the bolts 13, thereby permitting the field coil and pole to be withdrawn from the machine in-a direction parallel to the axis of rotation, without affecting the position of said auxiliary windin In machines constructed according to my invention the removal of one portion of the rame from another is an easy matter for ooaess the reason that the groups of coils bridging the, poles, between which the divisions of the frame occur, can be easilv removed.

I do not ,wish to be confined to the details shown, as many changes and modifications can be made without departing from the spirit andscope of my invention. For example I do not wish to be confined to the use of bridging members between the pole pieces as these may, if desired, be omitted. Also other means may be shown for securing the pole shoes to the pole pieces.

What I claim as new and desire to secure by Letters Patent is In a dynamo electric machine, a frame, field poles removable from said frame, removable pole shoes on said field poles, each of said pole shoes being divided along the center line of the pole, bridging members connecting adjacent pole shoes on adjacent field poles, main field coils 'on said field poles, a rigid distributed auxiliary field winding, said winding being arranged in groups of rigid coils mounted upon adjacent pole shoe sections of adjacent poles, and means for fastening said pole shoe sections independently to their corresponding poles, whereby a field pole and its field coil may be removed from the frame without affecting the position of the frame or of the auxih iary winding or pole shoes.

In testimony whereof I afiix my signature, in the presence of two witnesses.

Cl-IARL.*S E. LORD.

Witnesses ARTHUR F. Kwrs. FRED J. Kmsnr. 

